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When do plants care about CO2 fluctuations?

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  • When do plants care about CO2 fluctuations?

    Do plants care about CO2 fluctuations provided, at the lowest point in the fluctuation, the CO2 level is still above ~ 30mg/l (i.e. Rubisco is saturated at 30mg/l)?

    e.g.
    If, at a particular point in the water, the CO2 level is varying between 20mg/l and 40mg/l, I believe the plant WILL care (growth very poor, possible autofragmentation etc).
    However, if the fluctuation was between 30mg/l and 50mg/l, the plant WON'T care (since Rubisco fully saturates at 30mg/l anyway)?

    Am I understanding this correctly?

    Scott.
    6' Planted Tank (72" x 18" x 20") - 4 x 30W T8 Tri-Phosphors - 2 x Eheim 2217 'Classic' canisters
    Flourite substrate - Ocean Runner OR-2500 + AM1000 - Tunze Turbelle Nanostream 6045
    6.8kg Catalina CO2 - Red Sea Pro regulator - Swagelok B-SS4-A metering valve - Vecton 600 UV

  • #2
    That's how I understand it. Of course this means you might just have it wrong.
    Do you have the link? I would like to look at that thread again.
    Last edited by Tug; 09-09-2010, 07:56 PM.
    :encouragement: Roll You're Own: Greater Washington Aquatic Plant Association
    Mixed with a sound of water's murmuring
    a sensitive plant in a garden growing.

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    • #3
      For common aggressive fast growing thin leaved weeds, the range is 20-35ppm of CO2.
      For other species? It is going to be higher. they will still grow nicely, but to fully saturate, some might go quite high.

      We have 300 species +, maybe 5 have been tested for CO2 and light like this.

      Then only a few common weeds.
      As far as max levels, this is the same as Liebig's law, but applies to CO2(and light as well)

      Regards,
      Tom Barr
      www.BarrReport.com

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      • #4
        For common aggressive fast growing thin leaved weeds, the range is 20-35ppm of CO2.
        So Tom this is generally the 'indicator' plant group, i.e. fast growing stem plants that show up CO2 issues the fastest and therefore make a good 'indicator' to general CO2 levels?

        If the tank was filled just with these plants in the 20-35ppm range, would the answer to my question then be yes - i.e. provided the lowest point of any fluctuation was greater than 35ppm the plant wouldn't care about any fluctuation? Whereas at levels lower than 35ppm the plant would?
        6' Planted Tank (72" x 18" x 20") - 4 x 30W T8 Tri-Phosphors - 2 x Eheim 2217 'Classic' canisters
        Flourite substrate - Ocean Runner OR-2500 + AM1000 - Tunze Turbelle Nanostream 6045
        6.8kg Catalina CO2 - Red Sea Pro regulator - Swagelok B-SS4-A metering valve - Vecton 600 UV

        Comment

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